The CIA limited success in Vietnam would later lead to great American involvement in the region. The CIA major success in Vietnam was with the plot to overthrow the Diem government, as a means to bring a more reliable government to power. His blatant oppression and chaotic rule made support for him weak both from the American people and South Vietnamese. How could a nation justify fighting for democracy under such an oppressive ruler? The CIA was well aware that before any increased American involvement in the conflict, Diem would have to go. The CIA assisted the ARVN, in the ousting of Diem, but the success was ultimately limited when the Diem government was replaced with a military regime. The regime did prove helpful in the military implications
